CCNP Routing and Switching TSHOOT 300-135: Official Cert Guide

IPv4 Addressing Issues

An IPv4 address is made up of two parts: a network/subnet portion and a host portion. It is imperative that all devices in the same network/subnet share the exact same network/subnet portion. If they are not exactly the same, the PC could end up addressing the Layer 2 frame incorrectly and sending the packet in the wrong direction. Refer to Figure 9-1, which shows a sample subnet (10.1.1.0/26) with two PCs and their default gateway, R1.

PC1 (top) with IP address 10.1.1.10, host address 255.255.255.192, and DG: 10.1.1.1 and PC2 (bottom) with IP address: 10.1.1.20, host address 255.255.255.192, and DG: 10.1.1.1 are shown ...